查询词典 preform

M40J graphite fiber reinforced aluminum composite is fabricated by a vacuum liquid infiltration process and the effects of an acid phosphate binder on the properties of the fiber preform and its composite are studied in this paper.

以高模高强石墨纤维M40J增强铝基复合材料为研究对象，研究了真空液相压渗工艺中，偏磷酸铝粘接剂对纤维预制件抗压性能及复合材料力学性能的影响。

Finite element method ; shape optimization ; sensitivity analysis ; material forming ; preform design ; die design

有限元法；形状优化；灵敏度分析；塑性成形；预成形设计；模具设计

The final thickness of a product after the vacuum infusion process, which is equal to the fiber volume fraction, depends in part on the compression responses of the preform because one of the mold faces is flexible in VIP.

在VIP工艺中，零件的最终厚度也即是零件的纤维体积含量因单面模具和柔性真空袋的使用而部分地取决于预成型体的压缩响应。

The effects of dopant concentration, the molecular volume and the temperature of polymerization on the refractive index profile of the preform rods were investigated in detail.

观察到聚合温度对折射率分布的影响以及掺杂剂分子的分子体积在极端情况下(如溴苯与MMA分子的分子体积相似，联苯分子体积比MMA则要大的多)对折射率分布的影响，清楚地显示出分子体积在界面-凝胶聚合过程中所起的重要作用。

Considering the problems of spurgear precise plastic forming, such as high deformation resistance, poor flowability and especial hardness to fill cant of gear, technological plan was developed based on precise plastic forming technique, successive control principle and consecutive local deformation theory. Moreover, structures of the rolling preform die and the die with up and down wellrounded forcer for stamping-extrusion and bulge-extrusion combining forming were designed too.

因此本文的主要研究内容和结果如下：本文以某种直齿轮：模数m＝2，齿数z＝20，压力角α＝200，变位系数x＝0为对象，针对直齿轮精密塑性成形变形抗力大，流动性差，特别是成形中齿轮角隅部分更加难以充满问题，基于精密塑性成形技术、逐次控制原理以及连续局部变形原理提出了&直齿轮滚轧制坯－镦挤、胀挤复合精成形&的工艺方案，设计了滚轧制坯的模具结构和上下冲头带圆角的镦挤、胀挤复合精成形的模具结构。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐